The quality of the soil that enables water to move downward through the profile. Permeability is measured as the distance per unit time that water moves downward through the saturated soil.

Terms describing permeability are:
Very slow: 0.15 cm/hr
Slow: 0.15-0.5 cm/hr
Moderately slow 0.5-1.5 cm/hr
Moderate 1.5-5 cm/hr
Moderately rapid 5.00-15.00 cm/hr
Rapid 15-50 cm/hr
Very rapid >50 cm/hr